Hey CPlater,
Believe it or not---but my t/d isn't fasten to the frame. The two underneath storage compartments are built tight to the crossbraces of the "No-Floor Frame". I glued recycle shredded tire, the kind at lowes for edging flowerbeds, onto the frame rails--softer ride for the "Costta Lotta"--and should I need the trailer for hauling I can, with 2 Floorjacks and a little time--jack it up out of the frame and lay in ply and fasten by drilling holes in the side rails to secure it. The storage compartments hang low enough to keep it attached to frame. Over 1500 miles on it now and no problems with it even thinking about coming out unless I want it to. Check back to my photobucket because I'm going to add more camping pictures of our recent Rural trip. Hope this answers some questions. I leveled the trailer and built the floor in frame with s/c, then picked up floor and sat s/c on crossbraces to use as a table to do the walls--then sat it back in the frame to finish it up.
Til later by the fire--John T. & Linda

ps- I think the frame has angle welded to cross braces to put bolt thru and washer/nut fasten the floor-check the trailer closely for those????